So far with my bike I've had to replace the shoes both front and rear every year. Usually the fronts will still have some stopping power, but the rears will be shot. I've had to do this 3 years running now, and just got another new set for year 4. I've been buying them as a set off of eBay for around $20. Are this just the really cheaply made shoes that they wear out that fast? I have seen individual shoes for $20-30 a piece, but I don't know if they are designed to work any longer. One further point, when I install the rears usually I have to grind some metal off of one of the shoes otherwise the drum won't go back on. My drum is clean and rust free, but if you try to put it on it'll hang up on the actually pad area of the shoe and not slide into place.